Hello, Approximative 1 month ago I had a sexual contact with a girl, I used protection, with the exception of oral sex being unprotected. After 2 weeks this appeared fast (in 24 hours) on the base of the penis, with no fluid discharge whatsoever, it did not hurt or sensation of itching, at palpation it is rubbery-hard consistency. Other general symptoms I don't have. What can it be? and what kind of doctor I must visit?